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Basic crystallographic data and chemical character of the precursor of the vanadyl phosphate catalyst prepared in the medium of hydrochloric-acid

M. Brutovský and Š. Gerej

Department of Physical and Analytical Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, CS-04154 Košice

 

Abstract: The analysis of infrared spectra and X-ray diffractograms of the precursor of the vanadyl phosphate catalyst prepared in the medium of concentrated hydrochloric acid has enabled us to come to the conclusion that this species is vanadyl hydrogen phosphate crystallizing in the rhombic system with lattice parameters a = (9.71 ± 0.02) x 10-10m, b = (13.03±0.02) x 10-10m, and с = (13.96 ± 0.02) x 10-10 m, the volume of unit cell being V= 1766 x 10-30 m3 . The ratio n(P):n(V) = 1.1—1.2 is usually used for preparing the catalyst. Thus the precursor may generally be expressed as VОНР04.хН20. HзР04 .

Full paper in Portable Document Format: 425a589.pdf

 

Chemical Papers 42 (5) 589–593 (1988)

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